The Karabiner 00/11 is an uncommon production within the series of K11 Carbines. In response to shortages of firearms, Switzerland opted to refurbish and upgrade older 1900 and 1905 Short Rifles to the more powerful 7.5x55mm Swiss Gewehrpatrone 1911 (GP11) cartridge. Similar to the action used on the 96/11 and 1911 Infantry Rifle series, the serial numbers reflect a much older production. Though the 1911 rifle ceased production in 1919, the K11 was produced through 1933 as the Swiss military realized the benefit of outfitting their service members with shorter, lighter carbines.